Door check



J. M. MARlN Dec. 17, 1940.

DOOR CHECK Filed Feb. 16, 1940 3-4 Ej. Z

Patented Dec. 17, 1940 UNITED sTATl-:s

PATENT OFFICE 4 Claims.

This invention relates to a door check adapted both to silence the closing of a door and to cushion the shock occasioned by quickly closing the door.

By this invention a means is provided to utilize both the elastic properties of rubber, or other like materials; and the pneumatic resistance or cushioning effect resulting from the presence of one or more air pockets formed by or in the article.

The invention further relates to a new article of manufactur whereby a door check of the above stated Character is provided for attachment to a great variety of door constructions now in use, without making any alterations in structures.

Low cost of manufacture and extreme simplicity of construction are among the objects of the invention.

Other objects, advantages and features of invention may hereinafter appear.

Referring to the accompanying drawing, which illustrates what is at present deemed to be a preferred embodiment of the invention,

Fig. 1 is a transverse section through a door and its frame, showing the device in its operative position.

Fig. 2 is a front view of the device in its operative position.

Fig. 3 is a section of, the device on line 3-3 of Fig. 2.

Fig. 4 is a sectional view on line 4-4 of Fig. 2.

In Figs. 2, 3 and 4 the device is shown on a larger scale than in Fig. 1, and :a fragment of the door frame is included in each of the former three views.

Referring in detail tothe drawing, the article is shown as comprising a fiat basal rubber strip l having a plurality (two in the illustrated embodiment) of hollow, dome shaped projections Il upstanding from one of its faces in a longitudinally spaced relation to each other. The space between said projections is occupied by an out-pressed hollow bead |2, and when the article is in its attached position upon the door frame |3 said bead constitutes a projection which affords an air passage way M which connects the air chambers |5 of the hollow projections ll.

Attaching means ll are shown to secure the end portions of the strip Ill to the door frame, the intermediate portion of the strip being left in an unattached relation to the door frame in order' that air may enter to refill the chambers and passage 14 when the elasticity of the article causes it to resume normal position after the projections ll have been more or less fiattened by reason of the impact upon them of the edge portion of the hinged door 19.

Owing to the fact that a plurality of small, hollow, air containing, elastic projections are provided, which extend in a row along the midwidth of the elongated basal strip, an advantage is obtained over the result that would be secured if only a single, though'much larger projection, were to be provided; for the small projections provided have ample room, individually, to spread out laterally when the impact of the door against them compresses the air which they contain, whereas a single hollow projection, if made large enough to possess the desired amount of shockresistance, would require a wider space than that afforded by the door engaging strip which supports it.

Owing to the fact that the bumper, including its impact receiving wall portions, is made of a soft, spongy rubber, when an impact is received the small air spaces' in the cells of its walls cooper'ate with the large air spaces |5 to secure a better cushioning effect.

A layer of adhesive or cement 20 is shown underlying each end portion of the strip to serve as an attaching means instead of tacks or screws, if desired. Whichever kind of attaching means is used'the intermediate portion of the strip should be left in an unattached or loosely overlying relation to the door frame.

I claim:

1. An elastic door bumper comprising a fiat basal part securable to a door frame and a plurality of pneumatic hollow projections extending in a row from the same face of said basal part, there being spaces between adjacent projections to allow them to expand when subjected to an impact.

2. The subject matter of claim 1 and, there being a passage which connects the. interiors of said` projections with each other when the device is in its attached position.

3. An elastic door bumper comprising a flat, elongated, basal strip of rubber attachable to a door frame and furnished withetwo hollow projections upstanding from one of its faces in a longitudinally spaced relation to each other, said strip having an up-pressed bead occupying -the space between said hollow projections and affording an air passage between them.

4. As an article of manufacture, an elongated fiat strip having a pneumatic, chambered shock absorbing projection located at each side Vof its mid-length and in a spaced relationto an' end th'ereof, there being a bead in said strip which 

